Defending champion Rafael Nadal spoke after beating Jannik Sinner in straight sets and reaching the French Open quarter-finals on Monday. The 35-year-old joked that the most difficult thing about aging at Roland Garros is to keep having to celebrate his birthday there. But even after 13 titles he is "still passionate about what (he is) doing" and "happy to be where (he is). The third seed will next take on Diego Schwartzman of Argentina in the quarter-finals.